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Stock options and warrants (Schedule of Award Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Stock Incentive Plan [Member]
 
Shares Underlying Options  
Outstanding, beginning 707,940
Granted 474,270
Exercised   
Forfeited (6,644)
Outstanding, ending 1,175,566
Exercisable 261,506
Weighted Average Exercise Price  
Outstanding, beginning $ 13.98
Granted $ 2.09
Exercised   
Forfeited $ 2.43
Outstanding, ending $ 9.25
Exercisable $ 33.15
Weighted Average Remaining Contractual Term  
Outstanding 9 years 18 days
Exercisable 6 years 8 months 19 days
Aggregate Intrinsic Value  
Outstanding $ 85,200
Exercisble 10,400
Nonqualified [Member]
 
Shares Underlying Options  
Outstanding, beginning 598,507
Granted   
Exercised   
Forfeited (501)
Outstanding, ending 598,006
Exercisable 289,673
Weighted Average Exercise Price  
Outstanding, beginning $ 5.01
Granted   
Exercised   
Forfeited $ 54.00
Outstanding, ending $ 4.97
Exercisable $ 7.59
Weighted Average Remaining Contractual Term  
Outstanding 4 years 4 months 13 days
Exercisable 4 years 5 months 19 days
Aggregate Intrinsic Value  
Outstanding   
Exercisble   
Nonvested [Member] | Stock Incentive Plan [Member]
 
Shares Underlying Options  
Outstanding, beginning 508,435
Granted 474,270
Vested (62,001)
Forfeited (6,644)
Outstanding, ending 914,060
Weighted Average Exercise Price  
Outstanding, beginning $ 3.70
Granted $ 2.09
Vested 10.55
Forfeited $ 2.43
Outstanding, ending $ 2.41
Weighted Average Grant Date Fair Value  
Outstanding, beginning $ 3.07
Granted $ 1.78
Vested $ 8.58
Forfeited $ 2.04
Options, ending $ 2.03
Nonvested [Member] | Nonqualified [Member]
 
Shares Underlying Options  
Outstanding, beginning 8,332
Granted   
Vested (5,000)
Forfeited   
Outstanding, ending 3,332
Weighted Average Exercise Price  
Outstanding, beginning $ 3.42
Granted   
Vested 3.42
Forfeited   
Outstanding, ending $ 3.42
Weighted Average Grant Date Fair Value  
Outstanding, beginning $ 2.84
Granted   
Vested $ 2.84
Forfeited   
Options, ending $ 2.84